Reducing-valve.



No. 855,796. PATENTED JUNE 4, 1907.

' W. B. MASON.

REDUCING VALVE.

APPLIOATION FILED NOV. 23, 1905.

. 7- M1 um/3244M .tervals of time without UNITED STATES PATENT OFFICE.

'WILLIAM B. MASON, OF BOSTON,

MASSACHUSETTS, ASSIGNOR TO THE MASON REGULATOR COMPANY, OF SACO, MAINE, A CORPORATION OF MAINE.

REDUCING-VALVE.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed November 23,1905. Serial No- 288,656-

To all whom it may concern.-

Be it known that I, WILLIAM B. MAsoN, a citizen of the United States, residing at Boston, in the county of Suffolk, State of Massachusetts, have invented a certain new and useful Improvement in Reducing-Valves, of which the following is a specification, reference being had therein to the accompanying drawings.

In fluid pressure regulators or reducing valves as they are commonly called, such for instance as are shown in Letters Patent of the UnitedStates, No. 361,771, granted to me April 26, 1887, and No. 379,586, granted to me March 20, 1888, I find that under certain peculiar conditions the piston which operates the main valve chatters, i. 6. moves up and down with great frequency and rapidity and produces an unpleasant noise and undesirable variations in pressure in the low pressure system and causes the parts to wear unnecessarily.

My present invention has for its object to produce a valve which shall not be subject to these objections, and shall have a piston which shall move up and down at proper inchattering.

The invention will be fully understood from the following description taken in connection with the accompanying drawings, and the novel features thereof will be particularly pointed out in the claims at the close of the specification.

In the drawings,-Figure 1 is a vertical section of a reducing valve embodying my invention, the main and dash pot pistons being shown in elevation. Fig. 2 is a vertical section of the lower end of the dash pot piston, certain parts thereof being shown in elevation for greater clearness.

In the drawings,the valve casing is designated at A, the main valve at B, the auxiliary valve at C and the diaphragm at D. The inlet or high pressure pipe is attached at E to the left hand side of the valve, and the outlet or low pressure pipe at F to the right hand side of the said valve. These parts are in general the same as in any ordinary reducing valve, and I will not, therefore, describe them with greater particularit main piston G, by means of which the main valve B is operated, is located in a cylinder H in the lower portion of the casing A. It is this main piston G which is liable to chatter and cause the troubles hereinbefore referred to. The under side of the piston G is provided with a stem I which extends downwardly into a dash pot J, formed in the lowermost portion of the casing A. The stem I is provided at its lower end with a dash pot piston K, the object of which is to prevent the main piston H from coming violently in contact with its seat L at the end of its stroke, or from moving too rapidly during its up stroke. The upper portion of the piston K is formed of a size slightly smaller than the interior bore of the dash pot cylinder J, so that there may be a slight leakage past the said piston. Water grooves M are formed in the peripheral surface of this portion of the dash pot piston in the well-known manner. The lower end of the piston is turned down to a diameter considerably less than that of the remainder of the piston as shown at N for the purpose of receiving a friction ring O which when in place forms a part of the dash pot piston. The friction ring O is formed so that its outside diameter is slightly greater than the inside diameter of the interior of the dash pot. It is then sawed diagonally as shown at P, Fig. 1, the saw out being wide enough so that the ends of the ring O when inserted in the dash pot may spring together, thus giving to the ring a tendency to spring outwardly, original shape and diameter. This tendency to assume its original diameter causes the outside surface of the said friction ring O to engage firmly the interior surface of the dash pot and produces friction between the friction ring and the dash pot which prevents all sudden or violent movements of the piston and effectually stops chattering, etc. but does not interfere with the necessary movements of the valve piston.

The friction ring O is held in place by a screw cap Q, provided with a screw threaded stud R which screws into a correspondingly tapped hole in the lower end of the piston K. To make absolutely certain that this piston K shall not work loose, I provide a pin S which is inserted in a hole T drilled at right angles with the axis of the piston K. The pin S passes through the upper end of the screw threaded stud R. By this means the parts are effectively secured together, and there is no danger that they will become loosened or displaced under the frequent movement to which valve pistons of this kind are subjected.

lVhat I claim is:

1. In a reducing valve, the combination With the main piston, of a dash pot cylinder, a piston therein rigidly connected With the said main piston, and a friction ring forming a part of the said dash pot piston and adapted to engage the interior Walls of the dash pot cylinder and retard the movement of the main piston.

2. In a reducing valve, the combination with the main valve, of a dash pot cylinder,

a dash pot piston therein rigidly connected to the main piston, and having a portion of reduced diameter, a friction ring upon the said reduced portion, and a screw cap engaging the said piston and friction ring.

In testimony whereof I affix my signature, in presence of two Witnesses.

WILLIAM B. MASON. Witnesses:

GEORGE P. DIKE, J. HENRY PARKER. 

